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레이저에 의해 패터닝 된 바늘과 탄성중합체와의 마찰 효과
김재구(Jaegu Kim),노승국(Seungkook Ro),박종권(Jongkweon Park),조성학(Sunghak Cho),황경현(Kyunghyun Whang) 한국레이저가공학회 2012 한국레이저가공학회지 Vol.15 No.3
The friction force of patterned needle in elastomer have been investigated to verify the application for bio and plastic industry. The micro pattern on the needle surface were prepared by 266 nm, 20 ns laser and 800 nm, 220 fs laser, which were able to generate the different surface roughness. The friction force was measured by the load cell of 10 N capacity. As the results, the friction force of no patterned needle is almost constant during the needle penetrates the silicone rubber sample. However, the needle having asperities shows the variation of the friction force. The higher the surface roughness is, the smaller the friction force is until the surface roughness is very high. In our experiment conditions, the reduction of the friction force by 20 % compared to no pattern needle was achieved with straight and 50 μm discrete line generated by 266 nm, 20 ns laser.
지속 가능한 의류 산업 발전을 위한 의류 커스텀 및 리폼 디자인 공유 웹 플랫폼 개발
이승희(Seunghee Lee),황혜빈(Hyebin Hwang),박현주(Hyunju Park),박종권(Jongkweon Park) 한국HCI학회 2024 한국HCI학회 학술대회 Vol.2024 No.1
현대 의류 산업이 발전하면서 대량 생산, 대량 유통됨에 따라 의류 일회성이 일반화되어 환경 문제와 함께 사회적 문제도 발생하고 있다. 쿨레만 (Anne-Kathrin Kuhlemann) 의 논문에 따르면 “옷 입는 횟수를 2 배로 늘리면 의류 산업에서 배출되는 탄소량을 44%까지 감축시킬 수 있다.” 는 연구 결과가 있다. 본 논문에서는 의류 커스텀 및 리폼 디자인 공유 웹 플랫폼을 개발하여 생산자와 소비자, 디자이너가 함께 의류 산업 제로 웨이스트를 실천하는 커뮤니티를 조성한다. 이를 통해 소비자의 소비 습관을 변화시키고, 지속 가능한 의류 산업 발전을 이끌어 나갈 수 있는 발판을 마련하고자 한다.
조성락(Sungrak Cho),경진호(Jinho Kyung),노승국(Seungkook Ro),박종권(Jongkweon Park),노명규(Myounggyu Noh) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
A micro magnetic bearing system with five degrees of freedom active control has been designed for a miniature spindle to be used in a μ-factory. A shaft of the micro spindle is suspended by five set of hybrid magnetic bearings at each side of the shaft. Permanent magnets produce bias magnetic flux for the magnetic bearings and an electric motor(Φ 24,70W) is set between the magnetic bearings. Five eddy current sensors are used to measure the shaft position. An analytical model of the system is developed for the design purpose. This model is verified through 3-D finite element analysis. A prototype spindle is designed and currently under construction.
조성락,경진호,노승국,박종권 한국공작기계학회 2004 한국공작기계학회 추계학술대회논문집 Vol.2004 No.-
One of the obstacles for a magnetic bearing to be used in the wide range of industrial applications is the failure modes associated with magnetic bearings. These failure modes include power amplifier faults, position sensor faults, and the malfunction of controllers. Fault-tolerant magnetic bearing systems have been proposed so that the system can operate in spite of some faults. In this paper, we designed and tested a fault-tolerant magnetic bearing system. The system can cope with the actuator faults as well as the faults in position sensors, which are the two major fault modes in a magnetic bearing system.